<?php 
/* 
* 
*简单的一个备份数据类 
*author FC 
* 
*/ 
class backupData{ 
private $mysql_link;//链接标识 
private $dbName;//数据库名 
private $dataDir; //数据所要存放的目录 
private $tableNames;//表名 
private $whi;//表名 
public function __construct($mysql_link){ 
    $this->mysql_link = $mysql_link; 
} 

public function backupTables($dbName,$dataDir,$whi,$tableNames){//开始备份 

$this->dbName = $dbName; 
$this->dataDir = $dataDir; 
$this->whi = $whi; 
$this->tableNames = $tableNames; 
$tables=$this->delarray($this->tableNames); 
$sqls=''; 
foreach($tables as $tablename){ 
if($tablename==''){//表不存在时 
continue; 
} 
//************************以下是形成SQL的前半部分************** 
//如果存在表，就先删除 
//$sqls .= "DROP TABLE IF EXISTS $tablename;\n"; 
//读取表结构 
//$rs = mysql_query("SHOW CREATE TABLE $tablename",$this->mysql_link); 
//$row=mysql_fetch_row($rs); 
//获得表结构组成SQL 
//$sqls.=$row['1'].";\n\n"; 
//unset($rs); 
//unset($row); 
//************************以下是形成SQL的后半部分************** 
//查寻出表中的所有数据 
$rs=mysql_query("select * from $tablename $whi",$this->mysql_link); 
//表的字段个数 
$field=mysql_num_fields($rs); 
//形成此种SQL语句:"INSERT INTO `groups` VALUES('1499e0ca25988d','主任','','0');" 
while($rows=mysql_fetch_row($rs)){ 
$comma='';//逗号 
$sqls.="INSERT INTO `$tablename` VALUES("; 
for($i=0;$i<$field;$i++){ 
$sqls.=$comma."'".$rows[$i]."'"; 
$comma=','; 
} 
$sqls.=");\n\n\n"; 
} 
} 
$backfilepath=$this->dataDir.date("Ymdhis",time()).'.sql'; 
//写入文件 
$filehandle = fopen($backfilepath, "w"); 
fwrite($filehandle, $sqls); 
fclose($filehandle); 
return $backfilepath;
} 

private function delarray($array){//处理传入进来的数组 
foreach($array as $tables){ 
if($tables=='*'){//所有的表(获得表名时不能按常规方式来组成一个数组) 
$newtables=mysql_list_tables($this->dbName,$this->mysql_link); 
$tableList = array(); 
for ($i = 0; $i < mysql_numrows($newtables); $i++){ 
array_push($tableList,mysql_tablename($newtables, $i)); 
} 
$tableList=$tableList; 
}else{ 
$tableList=$array; 
break; 
} 
} 
return $tableList; 
} 
}
?>